Lecture 6

# Hence the coefficient f is introduced to account for

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Unformatted text preview: y be a fraction of the theoretical value. Hence, the coefficient f is introduced to account for incomplete air dissolution during pressurization: f P f P − Po Fair = QSout − 1 = QSout Po Po PIERO M. ARMENANTE NJIT Calculation of Pressure to Produce a Desired A/S Ratio (No Recycle Case) The flow of solids in the flotation unit is: Fsolids = Q X o Hence: Sout (f P − Po ) Sout f P Fair Air - to - solid ratio = = = − 1 Fsolids X o Po X o Po If the air-to-solid ratio is known from experiments the pressure to which the air must be pressurized can be calculated. PIERO M. ARMENANTE NJIT Calculation of Pressure to Produce a Desired A/S Ratio (Recycle Case) Q So Floatation Unit Wastewater Sin Sout Air An analysis similar to that conducted for the norecycle case gives: R Sout (f P − Po ) R Sout f P Fair Air - to - solid ratio = = = − 1 Fsolids X o Po X o Po PIERO M. ARMENANTE NJIT Air Flotation at Atmospheric Pressure In most cases the air flotation unit is operated at atmospheric pressure. Therefore, the depressu...
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